package demo1;

import java.util.concurrent.TimeUnit;

public class test1 {

    public static void main(String[] args) {
        D3 d3 = new D3();
        for (int i = 0; i < 10; i++) {
            d3.f1();
        }
    }
}

class D3{
    public void f1(){
        Integer i = 0;
        i++;
        System.out.println(i);
    }
}
